UBUNTU-CVE-2026-33939

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Source
https://ubuntu.com/security/CVE-2026-33939
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33939.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33939
Upstream
Published
2026-03-27T22:16:00Z
Modified
2026-04-02T17:31:27Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. {{*n}}), the compiled template calls lookupProperty(decorators, "n"), which returns undefined. The runtime then immediately invokes the result as a function, causing an unhandled TypeError: ... is not a function that crashes the Node.js process. Any application that compiles user-supplied templates without wrapping the call in a try/catch is vulnerable to a single-request Denial of Service. Version 4.7.9 fixes the issue. Some workarounds are available. Wrap compilation and rendering in try/catch. Validate template input before passing it to compile(); reject templates containing decorator syntax ({{*...}}) if decorators are not used in your application. Use the pre-compilation workflow; compile templates at build time and serve only pre-compiled templates; do not call compile() at request time.

References

Affected packages

Ubuntu:18.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.0.10-5?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.0.10-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.0.10-5",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.0.10-5",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.0.10-5",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33939.json"

Ubuntu:20.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.2-1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.1.0-1
3:4.5.3-1
3:4.7.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.2-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.2-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.2-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33939.json"

Ubuntu:22.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.7+~4.1.0-1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.6+~4.1.0-2
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33939.json"

Ubuntu:24.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.7+~4.1.0-1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33939.json"

Ubuntu:25.10 / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.7+~4.1.0-1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33939.json"